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Hey guys! I'm looking for additional clamp to hold onto a seatpost above the one on the frame.

The purpose of this would be to easily put seatpost back to the correct height after transporting bike inside a car. It seems that all clamps have the edge so they wouldnt slip off and/or are larger diameter. Is there anything like that on the market for a 27,2mm seatpost?

I know this is not a weightweenie's mindset, but i'm willing to sacrifice few grams to be sure of always having the same fit.

Rubber rings will move and the electrical tape can bunch up. The advantage of a clamp is you can push it against the lip of seat tube and tighten and when you reinstall height will be exactly right to the fraction of millimeter.

The problem with an extra clamp is that the top surface of the seat tube is not necessarily perpendicular to that tube's angle, and so in most cases only one point on a clamp would contact the true collar, or possibly the frame itself.